Ethiopian authorities say three university students have died in days of unrest largely along ethnic lines, and students say security forces have entered campuses to restore order.

Clashes in the Amhara region began Saturday and in the Oromia region Monday and some students have been evacuated.

Education ministry official Samuel Kifle said Wednesday some people behind the unrest had fake student IDs and arrests were underway.

Two students at Woldia University in the Amhara region and one student at Dembi Dollo University in the Oromia region died.

Ethnic conflicts have posed a major challenge to Ethiopia’s Nobel Peace Prize-winning Prime Minister Abiy Ahmed.

Also Wednesday, the attorney general said 68 people who took part in a June attack that killed Ethiopia’s army chief and others will be charged this week.